Method and apparatus fob regenera



3 Sheets-Sheet 1 May 2, 1950 H. P. CALDWELL. JR.. ETAL :muon Arm APPARATUS Fox REGENERATIoN oF mmm nxvrnmn Ansonsu'rs med .my s, 1946 A GENT OR ATTORNEY m :w 2 F o Lm ATS n m mmm J m Lm s www Bmw LPD APY AL w n P n May 2, 1950 H.

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JOHN h. P4 YNE INVENTORS ingang/g AGE TOR ATTORNEY May 2, 1950 Filed .my :5, 194s H. P. CALDWELL. JR. EI'AL 0D AND APPARATUS FOR REENERATION 0F FINELY DIVIDED ADSORBENTS 3 Sheets-Sheet 3 OO o og SL dwang,

AGENT 0R ATTORNEY UNITED sTATEs PATENT oEFicE METHOD AND APPARATUS FOR REGENERA- TION F FINELY DIVIDED ADSOEBENIS Hamilton P. Caldwell, Jr., and John W. Payne, Woodbury, N. J., assigner: to Socony-Vaouum l(gli (crimgany, Incorporated, a corporation of ew or Application July 3, 194B, Setlll N0. 681,232 14 Ultima. (0L 252-417) This invention has to do with a method and erate the finely divided clays by burning in apparatus for reviviflcation of finely divided adrotary kum, but dus e0 the high amount 0f sorbent materials which have become spent by carbonaceous deposits to be removed. the small deposition of a combustible contaminant thereparticle sin of the clay and the lack of adequate upon. Such finely divided or pulverulent ma- 5 temperature conn-01, such rotary kun ernment, terials may become spent during use for a numresult in the overheating of the clay to tcmber of purposes such as use as a lter aid, use peratures that permanently impair the deas a reiining agent in sugar purification, use as colorizing emciency thereof. and the tendency a catalyst for conducting hydrocarbon confor the clay particles to agglomerate, thereby versions, and use as a decolorizing or purifying rendering the clay practically valueless as a dematerial in the reiining of hydrocarbon oils. colorizing and purifying agent for hydrocarbon Such nely divided adsorbents may take the oils. Attempts to regenerate spent nely divided form oi' activated charcoals, bauxites, natural contact clays by passage of the clay as a subclay such as fullers earth. treated clays, and stantially compact downwardly gravitating synthetic associations of silica. alumina, or silica 5 column through a confined, vertical burning and alumina, commonly called gels. zone containing heat transfer tubes have proved The nnely divided adsorbents to which this unsatisfactory because of the inability to propinvention particularly pertains are adsorbents erly control the temperature ot particles of auch having a particle size falling within the broad small diameter bearing the very high deposits o! range of about 100 mesh and liner and usually 20 combustible material characteristic of spent within the range of 200 mesh and finer by Tyler contact clays and because of the tendency for Standard Screen Analysis. It is with this meanthe nnely divided clay to cake and bridge thereby lng that the term "finely divided is employed interfering with its ow and because of the tendin describing and in claiming this invention. ency of both the air and clay streams to chan- Typical of the processes in which such nel. As a consequence. when petroleum oils are pulverulent materials are employed is the condecolorized and purified by means of finely tact clay treatment of hydrocarbon oils to effect divided contact clays, it has been common pracdecolorization and purification thereof. Such tice to discard the spent contact clay after the contact clay treatments are well known to the naphtha washing and steam purging thereof and art and need not be further described herein. I to replace the discarded clay with newclay. During the contact treatment oi' hydrocarbon This practice, made necessary by the inability to oils, the finely divided clay gradually becomes properly and economically regenerate finely spent by the deposition thereon of carbonaceous divided adsorbents. has rendered an otherwise contaminants, some of which are of very high excellent method for rening petroleum oils molecular weight and not easily vaporized. It is :i economically unattractive both because of the customary to wash such spent clay with petrohigh clay replacement cost and because of the leum naphthas for the purpose of removing loss of substantial quantities of valuable hydrooccluded oil therefrom. The naphtha wash is carbons deposited on the discarded clay. followed by a steam purging in order to permit A major object of this invention is the prorecovery of the wash naphtha. After this treat- 4u vision of a practical method for the controlled ment, the contact clay may still contain a subregeneration oi' finely divided adsorbent ma.- stantial amount of adsorbed naphtha and valu- Dterials. able hydrocarbon oils as well as non-vaporizable A specific object is the provision of a method coky material. Its deeolorizing emciency after for regeneration oi ilnely divided contact clays even only one use is substantially below that of which have become spent by use as decolorixing the fresh clay and will decrease even further and purifying agents in hydrocarbon oil rennupon re-use. The reviviiication of such finely ing, which method not only permits satisfactory divided clays depends upon the removal of subremoval oi' contaminant deposits without the stantially all oi' the carbonaceous deposit thereoverheating of the clay but which also permits from without permitting the clay temperature to 5| recovery of substantial amounts of the vaporisrise to a heat damaging level. Treatment of able constituents deposited upon the spent clay. such spent clays with solvents has been proposed, Another object is the provision of improved but the economics of such solvent regeneration methods for providing uniform contacting beprocesses make such methods commercially lmtween finely divided adsorbent particles and a practical. It has also been proposed to regengaseous material.

Another object is the provision in a process for regeneration of nnely divided adsorbents bearing carbonaceous contaminants of a means for utilizing a substantial portion of the heat liberated in contaminant combustion for preheating the spent adsorbent to temperatures which will effect distillation of volatile contaminant constituents.

Another object is the provision in a process for regeneration of spent contaminant bearing iinely divided adsorbents of a method and apparatus permitting the utilization of the heat requirements for preheating the adsorbent and for distilling vaporizable contaminant constituents as an aid in controlling the adsorbent temperature during combustion of the nonvolatile contaminant constituents.

These and other objects of this invention will become apparent from the following description of the invention. Before proceeding with this description, several terms used in describing and in claiming this invention will be defined. The expressions gas" or "gaseous material" are intended to mean that material existing in the gaseous phase under the particular operating conditions involved regardless of what may be the normal phase of that material at ordinary atmospheric conditions. The expression Vaporizabie constituents when applied to contaminant constituents deposited on the spent adsorbent is intended to mean those constituents which may practically be removed as gases either by simple vaporization or by virtue of decomposition or cracking when the spent adsorbent is subiected to temperatures of the order of '10o-950 l". and the stripping effect of sumcient oxygen-free stripping gas to at least maintain the adsorbent in a iluidized condition. The expression nonvaporizable constituen is intended to mean those coky constituents remaining on the adsorbent after the above described treatment. The expression iiuidized condition will be deiined hereinafter. The expressions heat damaging level or "heat damaging temperature" are intended to mean temperatures which are high enough to cause substantial permanent impairment of the properties oi' the particular adsorbent involved which render it useful for the particular process in which it becomes spent. For example, in the process of hydrocarbon oil refining with contact clays, the properties involved are decolorizinf,r and purifying properties. Several other terms used in claiming the invention are dei-ined during the course of the description of the invention.

In a broad aspect the instant invention involves the passage of a finely divided adsorbent material serially through a distilling zone wherein it is heated in the absence of oxygen to a temperature sumcient to distil oi! the vaporizable contaminant constituents, a burning zone wherein the coky, non-vaporizable contaminant is burned and a cooling zone wherein the adsorbent is cooled. The adsorbent is passed through each zone as a horizontally moving bed which is maintained in a tluidized condition by the passage of a suitable gas upwardly therethrough. During its passage across each zone the nuidized mass is subjected to indirect heat transfer with a suitable heat exchange iluid. The gas employed for this purpose in the distilling zone is a substantially oxygen-free gas. The gas employed in the burning zone is an oxygen containing gas and the gas employed in the cooling zone may or may not contain oxygen. Certain other important aspects of this invention will be explained hereinafter.

The invention may be more readily understood by reference to the drawings attached hereto of which Figure l is an elevational view. partially in gestion. showing a preferred form of the inven- Figurezisaseotionalviewofoneoftheapparatus elements shown in Figure l. taken at line 2-2 of Figure l,

Figure 3 is a sectional view of a different level in the same apparatus taken at line 3 2 of Figure l. and

Figure 4 is an elevational view, partially in section, of a modiiied form of the invention. All of these drawings are highly diagrammatic in orm.

Turning now to Figure l. there is shown a distilling chamber III which is, at its base, rectangular in cross-sectional shape and which is provided with a gable shaped roof Il. The floor and iour sides of the distilling chamber are made up oi' refractory or insulating material which may consist of refractory bricks or which may consist of other types of insulating material enclosed in metal sheaths as shown. In the drawing the iioor I2 and ends I3 and Il of the chamber are visible. Also visible is the gable top roof I5 also made up of refractory bricks or metal encased insulating material. Refractory rooiing material ii is supported by upwardly sloping beams such as shown at It which are. in turn, supported by beams I1, I8, I9 and 2li and end walls i3 and I4. The supporting beams II-20,

' inclusive, extend at least partially through opposite vertical walls of the chamber and are supported thereby. On the bottom I2 and extending along the four sides of the chamber are H beams or other suitable support members 2i which form a platform along the edges of the chamber upon which rests the foraminate or perforated partition 22. The partition 22 is further supported by a plurality of spaced-apart small, square, or rectangular plates 23 which are, in turn. supported from the chamber oor by a plurality of vertical rods 2l spaced at intervals under the partition 22. The arrangement may be better understood by reference to Figure 2 which is a sectional view taken at lines 2-2 in Figure l.

In Figure 2, the four walls I3, Il, 2B and 26 of the vessel of the chamber may be seen. Also shown, is the partition 22 with perforations 21 uniformly distributed across its area. Also, indicated by dotted lines along the edge of the four walls, are the support beams 2|, and also shown by dotted lines are the support plates 22 and rods 2|. It will be readily understood that other suitable means for the support of the foraminate partitions 22 at a spaced interval above the oor of the vessel may be substituted for the construction shown. The purpose of the construction is to provide a gas inlet distributing space 2B which is fed by gas through an inlet pipe 2l. The height of this chamber 2B may vary widely, depending upon depth of bed and rate of gas now. The perforated partition 22 may take a number of forms, for example. it may take the form of a screen and it will be understood that the expressions perforated partition" and foraminate bottoms" as used in describing and claiming this invention are used in this broad sense. The perforations in the partition should. in general, be of such size as to prevent substantial ilow oi. the particular adsorbent material in- 'gas inlet holes 21 volved therethrough. A gas outlet duct 21 is connected to the roof i i of the chamber. The duct 31. connects into a withdrawal pipe 32 which oonducts the gas into a scrubber 2l. Above the partition 22 and within the chamber I3 are positioned a number of horizontal rows of horizontally extending spaced-apart tubes 3l connected between an lmet header 3| and an outlet header 32. The arrangement of these tubes may be more clearly seen from a study of Figure 3 which is asectional view takenatline3-3ofligursl. and wherein like elements bear like numerals.

` upwardly from one end of chamber il is an elongated vertical adsorbent feed duct Il provided with a feed hopper 3l at its upper end. The feed duct 24 extends into one end of the chamber i and is of such width as to extend horizontally across the width of the chamber. It has been found that the lower end of the duct 3( should terminate within the chamber I0 at the level at which it is desired to maintain the particles in the distilling chamber, which level is Just above tubes 30. The desirable depth of the iluidized bed of adsorbent material to be maintained above the partition 22 will vary somewhat depending upon the required duration of treatment and may vary widely up to several feet in depth. However, due to the tendency of gas entering the fluidized bed from any particular distributing orice. to "rat hole" or channel upwardly through the bed, in order to insure proper uniform uidization of the entire bed it has been found that the bed must be at least suillciently deep above the gas distributing partition 22 that the surface of the bed is above the level of intersection of lines drawn upwardly from adjacent in partition 22 at an angle roughly equal to the angle of internal ow of the adsorbent material. 'I'he angle of internal tlow for clay type adsorbents generally lies within the range about 65-80 degrees with the horizontal. Broadly, it may be said that the bed of uidized ymaterial should be maintained at a depth which is never less than about 2-4 times the distance between holes 21 in the partition 22. This ad- Justment of the bed depth may be easily controlled from the outside of chamber I0 during its operation by adjusting the level of M2 which slides concentrically along the end of duct Il and may be ilxed at any level by set screws |43. Extending downwardly from the opposite end of the chamber i0 is an adsorbent outlet duct 38 similar in construction to the inlet duct 3l. The lower end of duct 3B terminates within a burning chamber 40 which is positioned vertically below distilling chamber I Il. An ad- Justable end piece |44 similar to end piece |42 is provided in the lower end of duct 36. The burning chamber 40 is similar in construction to the distilling chamber i0 but may be of somewhat greater horizontal length. Visibie in the drawing,` is the floor I2, one end 43, and the gable shaped roof 4|. rows of horizontal heat transfer tubes 44 connected between inlet header 4I and outlet header I6, the perforated partition Il supported a spaced distance above the floor 42 so as to provide a gas inlet distribution chamber 48 supplied with gas through inlet conduit t9. The lower end of the duct 36 which supplies adsorbent from distilling chamber It into burning chamber 40, i. e. end piece i, should terminate above the level of tubes Il.

The lower section of the end of the chamber l0 which is opposite the adsorbent inlet end Il is in communication with a cooling chamber It subend piece stantially above 200 i against the escape stantialiy along its entire width. A box beam Il and refractory partition l2 serve to provide a wall across the upper section of the communicating ends of chambers 40 and Il so that these chambers communicate only up to that level therein which is substantially filled provided between chambers 4B and ill should terminate Just above supply of gas into the chamber 80. The perforated partition 88 in vessel 50 may, if desired, consist of a continuation of the partition 4l of the burning chamber l0, as 'is shown in the drawing. An adsorbent outlet duct Il which extends horizontally substantially across thi vsvdth of chamber 50 is provided adjacent to en Gas outlets and t8 extend upwardly from the roofs of chambers 40 and 5D, respectively, and communicate through duct t8 to a cyclone dust separator 69. Also shown in the drawing of Fignre l is a heat exchange fluid cooler or heater 10. which may be of conventional type, well known to the art, and a gas generator 1I which may also be of conventional construction. As an example of the operation of the apparatus arrangement described hereinabove, its application may be considered to the regeneration of a contact clay, which has become spent by utilization as a decolorizing and purifying agent in the refining of petroleum oil. such a spent contact clay may contain, as an example, about 1 to 3 per cent hydrocarbon oil boiling within the range 700 l". and upwards, 2 to 8 per cent non-volatile coking material and a certain amount of water. Spent adsorbent material usually existing at atmospheric temperature or at temperatures not sub- F., is distributed uniformly across one end of the partition 22 within the distilling chamber i0 by means of feeding duct 34. The duct 34 is maintained substantially full of adsorbent material and is of suiicient length so that when so filled it serves as a substantial seal of gas from chamber itl therethrough. Inert gas. such as ue gas, may be introduced into the feed leg 34 at intervals through Jets 'i5 and 'I6 so as to maintain the adsorbent in the leg in a flutfed ting chamber 28 below the partition 22 in chamber I0. The hot flue gas passes upwardly through all of the perforations in the partition 22 at a rate so controlled as to maintain the finely divided adsorbent material supplied onto partition 22 as a continuous uniformly iiuidized bed extending entirely across the partition Il. In this iiuidized condition, the individual adsorbent particles of the bed move around freely in a type of semi-suspended state so that the entire bed of iinely divided adsorbent takes on flow characteristics which are substantially similar to those of a liquid iluid. The gas rate is slightly below that which would entrain substantial amounts of the ilnely divided particles from the chamber. The rate oi gas ilow required to obtain a nuidiaed condition oi' bed will vary depending upon the particle size and density of the particular adsorbent material involved. The proper rate of gas now can be readily determined either by routine experiment or by equations published in the art and the tluidized condition may be readily recognized by the liquid iiow properties immediately assumed by the adsorbent particles under these conditions. It is with the above meaning that the term "iiuidized condition" is used in the describing and in the claiming of this invention. When the adsorbent bed within the chamber i has become uidized, it moves freely horizontally across the chamber Iii and may be withdrawn from the opposite end of the chamber iii through the drain duct 36. The height oi' the bed within the chamber ill may be controlled by the control o! the level of the lower end of duct 34. A suitable heat exchange fluid which may be heated in the heater N is conducted through conduits 18 and 19 into the inlet header li and then through the heat transfer tubes 30 within the distilling chamber. The heat exchange medium passes to outlet header 32 and is withdrawn therefrom through outlet conduits Il and 8i. Thus, by means of the heat exchange nuid passed through tubes I0 and, further, by means of the hot ilue gas introduced through inlet 29, the adsorbent material is heated within the chamber i0 to a temperature suitable for the vaporization of the vaporizable constituents in the contaminant deposited upon the adsorbent. These vaporized constituents obtained both by straight distillation and by cracking down of heavier constituents are withdrawn along with the hot ue gas through outlet 31 and then passed through conduit 38 into the scrubber 39. The scrubber 39 may be of conventional construction. weil known to the art, cooling water is introduced into the upper section thereof through conduit I3, uncondensed gas is withdrawn through conduit B4 at the top thereof and a mixture of water and recovered liquid hydrocarbon products is withdrawn through conduit B at the bottom thereof. The ilnely divided adsorbent containing non-vaporizable. coky constituents passes through vertical duct 3B onto the perforated partition 41 of burning chamber lil. The duct 38 is of such length that the column of adsorbent maintained therein serves as a seal to prevent substantial gas flow between chambers I0 and Il. An inert gas may be introduced through iets IB and l1 into the leg 36 to nui! the adsorbent into a more owable condition. A combustion supporting gas such as air may be introduced by means of a high pressure blower 90 through conduit 9| and inlet conduit 49 into the chamber I at a rate so controlled by valve $2 that the gas ilowing upwardly through the perforations in the partition l1 is not only sufilcient to supply the oxygen required for substantially complete combustion of the contaminant remaining upon the adsorbent material but is also sumcient to mainthe ilnely divided adsorbent as a continuous iiuiiiiaed bed which extends entirely across the area of the partition I1. The height of the bed in burning chamber Iii is controlled by the level oi' the lower end of the inlet duct 36. The iluidiaed adsorbent bed passes substantially horizontally across the burnirm chamber and the temperature ol the adsorbent is controlled by means o! a heat exchange iiuid circulated through the tubes M. This heat exchange fluid may be supplied from a suitable external source, separate from the source of heat exchange iiuid supply for the distilling chamber, or, in a more preferred form of the invention. the same heat exchange fluid may be employed. Thus, as is shown in Figure 1, the heat exchange fluid issuing through conduit 8B from the distilling chamber. having been cooled somewhat in said distiliin chamber is passed through conduit Bi into the inlet header Il serving the heat transfer tubes in the 4burning chamber l0. The fluid in passing through the tubes Il picks up heat from the adsorbent in the burning chamber and is withdrawn through header IB from conduit 93 into the pump 84 by which it is pumped via conduit 95 back to the heater 1U wherein its temperature is adjusted to a level suitable for charge back to the heat transfer tubes in the distilling chamber. In this manner, the heat of contaminant combustion released in the burning chamber l0 is made available for heating the incoming spent adsorbent in the distilling chamber lil and for distilling from the adsorbent the vaporizable contaminant constituents. At the same time. the heat required for heating the incoming spent adsorbent and for distilling vaporizable contaminant constituents is utilized as an aid in controlling the adsorbent temperature during the combustion of the non-volatile contaminant in the burning chamber lli. I! the heat required for heating the adsorbent and distilling the vaporizing contaminant constituents is less than that recoverable i'rom contaminant burning then the heater lil is used as a cooler by the passage oi' cold air therethrough. The regenerated ilnely divided adsorbent still moving as a iluidiaed bed passes from the burning chamber Iii into the communieating cooling chamber Bil through which it iiows in a horizontal direction while being cooled by means oi a cold gas such as air or iiue gas introduced through inlet conduit B2 at a rate so controlled by valve 98 that the bed is maintained in a iluidized condition. Additional heat may be removed from the adsorbent, when necessary. by the circulation of a suitable heat exchange uid through the heat transfer tubes Il. This huid may be introduced through conduit $1 to the inlet header I1 and withdrawn from outlet header 58 through conduit 98. The heat exchange duid passed through the heat transfer tubes in any of the chambers may take any of a number of forms. For example, it may consist of a low melting point metallic alloy or of certain mixtures of fused inorganic salts such as a mixture of the salts oi potassium nitrate and nitrite. On the other hand. the heat exchange fluid may take the iorm of a gas such as steam or air usually circulated under pressure.

The ilue gas from the burning chamber I0 and the gas from the cooling chamber are withdrawn from the upper ends of said chambers through ducts 8! and BB, respectively, and then passed 4through conduits 61 and l! into the cyclone dust separator 6l wherein any entrained adsorbent material is separated from the gas and removed from the separator through conduit Il. The substantial dust free gas passes from the upper end of the separator through conduit |00. In conducting the operation above described it has been found that a greater uniformity of inlet gas distribution into the finely divided adsorbent bed may be obtained in any of the chambers by the maintenance on the bottom of the chamber-i. e., on the perforated partition, of a xed bed of particle form solid material having a substantially larger particle size range than the ilnely divided adsorbent. For example, in a process for regeneration of adsorbent particles falling within the size range of about 20D-400 mesh by Tyler Standard Screen Analysis. A suitable particle size for the xed bed is of the order of 8 to 100 mesh. The depth of the fixed bed on the perforated partitions should be at least equal to about half the distance between gas inlet holes 21 in partition 22. Beds of coarse material, having a depth up to about four times the distance between holes 21 in partition 22, are satisfactory. In operation. due to the larger particle size of the solid material in the fixed bed, the gas rates employed to fluidize the bed of nnely divided adsorbent are not sumciently great to fluidize the fixed bed. Thus, the fixed bed serves as a highly emcient means for uniformly distributing the incoming gas to all sections of the cross section of the fiuidized bed of ilnely divided adsorbent. The material used for the fixed bed may be adsorbent material of the same nature as the finely divided adsorbent which is being regenerated, or it may take the form of an inert refractory material or even of particles of metallic material:`

It will be understood that the construction of the distilling, burning and cooling chambers and of the means for introducing adsorbent thereinto may take a number of modified forms all within the scope of this invention. Such a modlfled form is shown in Figure 4 wherein is shown distiiling, burning and cooling vessels |0|, |02 and |02, respectively, of substantially rectangular cross-sectional shape and having dat roofs I 04, |00 and |00, respectively. The roofs and side walls of these vessels are made up of refractory material. and metallic internal linings |01, |00 and |00 are provided within the vessels |0I, |02 and |03. respectively. Looking at the distilling vessel |0| it will be found that rows of heat transfer tubes are provided therein, extending horimentally thereacross in a direction transverse to the length of the vessel. The heat exchange tubes ||0 are supplied in parallel with heat exchange iuid from a common rectangular shaped external manifold indicated by the dotted lines lli, and which manifold is supplied through conduit I|2. A similar outlet manifold box and outlet conduit therefrom (not shown) are provided on the opposite side of the distilling vessel. Similar heat transfer tu-bes H0 and lll, inlet manifold boxes Ill and IIB, and inlet conduits ||1 and lll are provided i'or vessels |02 and |03, respectively. It will also be seen from Figure 4 that in place of the perforated partitions employed in the apparatus construction of Figure l for gas distribution, in the vessels lli. |02 and III, there are provided along the bottoms thereof a horizontal row of gas inlet tubes lil, |20 and |2|, respectively, extending horizontally across said vessels in a direction perpendicular to the plane of the drawing: Adjacent tubes H9 in vessel |0| are connected together in such a manner as to form two banks ol tubes in series, one bank being supplied by the inlet conduit |22 and the other bank being supplied by the inlet conduit |22; and the last tube in each banki. e..

the one located near the center of the vessel. being closed on one end. Perforations are provided along the lower side of the tu-bes to permit the gas introduced thercinto to pass upwardly through the vessel- A similar arrangement is provided for the tubes |20 and I2| in vessels |02 and |03. respectively. gas inlets |24 and |25 being provided for tubes |20 and inlets |26 and |21 being provided for tubes |2|.

It will be understood that other arrangements of these gas inlet tubes and means for introduction of gas thereinto, which will be readily apparent to those skilled in the art, are contemplated as being within the scope of this invention. Gas

, outlets |20, |20 and |20 are provided at the tops o1' vessels |0I. |02 and |03, respectively. Finely divided adsorbent material may be introduced into the distilling vessel I0| from hopper IBI by means of a screw conveyor |32 which may be driven by conventional means. The adsorbent iiows horizontally across the distilling chamber |0| as a uniformly iluidized bed in the same manner as described for the apparatus of Figure 1 and is withdrawn from the opposite end of the vessel |0| by means of a screw conveyor |22. It will be understood that. in order to eiect the uniform inlet distribution of adsorbent across the entire width of the distilling vessel and in order to eifect uniform withdrawal of adsorbent from across the entire width thereof. horizontal rows of spaced-apart screw conveyors may be employed for adsorbent introduction and withdrawal. The adsorbent from the screw conveyor |33 drops into the screw conveyor |24 by which it is introduced into the burning vessel |02. An inert gas may be introduced at |05. if desired, to improve the seal between the vessels |0| and |02. The adsorbent passes horizontally across the vessel |02 as a fluidized bed and is withdrawn from the opposite end thereof through screw conveyor l from which it may be conducted, via conveyor |21. into the screw conveyor |00 feeding the cooling vessel. Cooled adsorbent is withdrawn from the opposite end of the cooling vessel by means of screw conveyor |39. The operation of the distilling, burning and cooling vessels and the heat exchange uid systems and gas handling systems in the apparatus arrangement shown in Figure 4 may be similar to that already described in Figure 1. If desired, a iixed bed of solid particles of larger size range than the finely divided adsorbent may be maintained along the bottoms of vessels |0I, i02 and |02, in which case the depth of the bed should be such as to provide a xed bed depth above the gas inlet tubes H0. |20 and |2| of at least one-half the distance between orifices in said tubes.

It has been found that by the passage of ilnely divided adsorbent material as a continuous fluidized horizontally moving bed through zones provided with properly spaced heat transfer tubes s. degree of adsorbent temperature control may be obtained which is far superior to what would be expected upon the basis of previous results wherein the adsorbent contacts heat transfer surfaces as a substantially compact flowing column of finely divided adsorbent. As a result. tlnely divided adsorbent materials containing very high contaminant deposits may be satisfactorily regenerated by the method of this invention without overheating of the adsorbent to heat damaging levels. Moreover, by the passage of heat exchange fluid in series through tubes in the distilling and burning zones a considerable accetta reduction o! heating and cooling costs is effected. It has further been round that operation according to the method oi this invention permits the movement oi the imely divided adsorbent through the distilllng, bulnlng and cooling steps without channeling or bridging or calming oi' the solid material, and permits a uniformity or' gassolid contact not heretofore obtained. The maintenance o! nxed beds of substantially larger particles along the bottoms of the distllllng. burning and cooling vessels has been round to greatly improve the uniformity ot gas admission and the uniiormity of gas-solid contacting.

'I'he rate of solid now through the several chambers may be largely controlled by the rate of withdrawal thereirom. 1n the arrangement shown in Figure l. the rate ot cooled regenerated solid withdrawal from the cooling chamber 50 may control the rate o! solid now through all the chambers.

The temperature maintained in the several chambers will depend somewhat upon the particular type oi' contaminant deposit which is to be removed ii'om the adsorbent and upon the characteristic heat damaging temperature ol' the adsorbent. In the regeneration o! contact clays used ior hydrocarbon oil renning the temperature in the distilling chamber may tall within the range about ibo-95o F., the temperature in the burning chamber within the range about 'i50- 1200 F., and the cooled adsorbent issuing from the cooling chamber may be at any desired temperature ranging trom substantially atmospheric temperature upwards.

It will be understood that the particular details of apparatus design and arrangement and examples oi' operation and or the applications of this invention are intended as illustrative and are not to be construed as limiting the scope of this invention except as it may be limited by the following claims.

We claim:

1. The method for revivifying nely divided adsorbent materials bearing carbonaceous deposits which method comprises: passing a continuous stream oi' said nnely divided contaminant bearing adsorbent in a substantially horizontal direction through Yim elongated conlined zone wherein it is heated by indirect heat transfer with a suitable heating xiuid to a temperature suitable ioi' vaporization oi' the vaporizable constituents of said contaminant, passing a, substantially oxygen-free gas upwardly through said stream transversely to its direction of ow at a rate sucient to maintain said adsorbent in a iiuidized condition and to strip said vaporizable constituents from said adsorbent, withdrawing said oxygen-free gas and stripped vaporizable constituents from the upper section of said distilling zone, passing said stream adsorbent from said distillmg zone through a separate burning zone in a substantially horizontal direction while passing a suitable heat exchange fluid in indirect heat transfer relationship therewith to control the temperature of said adsorbent at a temperature range suitable for combustion of said contaminant and below a heat damaging level, passing an oxygen containing gas upwardly through said stream in said burning zone in a direction transverse to the flow of said stream and at a rate suiiicient to maintain said adsorbent in said burning zone in a iluidized condition and to effect substantially complete combustion of the contaminant remaining on said adsorbent, withdrawing nue gas from the upper section of said burning zone, passing said stream of adsorbent rom said burning zone through a communicating cooling zone in a substantially horizontal direction while passing a low temperature gas which is inert to the adsorbent upwardly through said stream in said cooling zone in a direction transverse to the flow of said stream at a rate suiiicient to maintain said adsorbent in said cooling zone in a fiuidized condition and withdrawing cooled revivir-led adsorbent from said cooling zone.

2. The method for revivifying iliiely divided adsorbent materials bearihg carbonaceous deposits which method comprises: passing a continuous stream of said finely divided contaminant bearing adsorbent in a substantially horizontal direction through an elongated, confined distilling zone wherein it is heated by indirect heat transfer with a suitable heating fluid to a temperature suitable for vaporlzation of the vaporizable constituents of said contaminant and to a temperature suitable for subsequent initiation of residual contaminant combustion, passing a substantially oxygen-free gas upwardly through said stream transversely to its direction of flow at a rate sumcient to maintain said adsorbent in a iluidized condition and to strip said vaporizabie constituents from said adsorbent. withdrawing said oxygen-free gas and stripped vaporizable constituents from the upper section of said distilling zone, passing said stream ot adsorbent from said distiliing zone through a separate burning zone in a substantially horizontal direction while passing a suitable cooling fluid in indirect heat transfer relationship therewith to maintain said adsorbent below a heat damaging level, passing an oxygen containing gas upwardly through said stream in said burning zone in a direction transverse to the ow of said stream and at a rate sufficient to maintain said adsorbent in said burning zone in a huidized condition and to eifec't substantially complete combustion of the contaminant remaining on said adsorbent, withdrawing nue gas from the upper section of said bu.ning zone, passing said stream of adsorbent from said burning zone substantially horizontally through an elongated coni-ined cooling zone wherein it is cooled by indirect heat transier with a suitable cooling huid, passing a gas, inert to said adsorbent, upwardly through said stream in said cooling zone in a direclion transvase to the now oi said stream at a rate sumcient to maintain said adsorbent in said cooling zone in a iiuidized condition and withdrawing cooled revivied adsorbent from said cooling zone.

3. The method of claim 1 tui-ther characterized in that the contaminant bearing adsorbent is supplied into one end of said disiilling zone from a column of said adsorbent of substantial height, said column providing a gas seal, and in that sai: adsorbent is passed downwa; diy from the opposite end of said distilling zone as a second confined column into one end of said burning zone, said second column providing a seal against gas now between said distllling and burning zones.

4. The method for regenerating a finely divided contact clay. which has been employed for the decolorlzation of hydrocarbon oils which method comprises: feeding said finely divided contact clay bearing a carbonaceous contaminant deposit into one end ofV a substantialy horizontal distilling zone from an upwardly extending seal column of said ciay, nowing said clay as a continuous uidized bed of much greater horizontal than vertical dimensions substantially horizontally through said dlstilling zone while introducing an oxygen-free gas through a plurality of openings distributed uniformly over the bottom of said zone and passing it upwardly through said bed at a rate suilicient to maintain it in a fluidized condition, passing a suitable heating huid in indirect heat transfer relationship with said clay in distilling zone to heat it to a temperature suitable to distil oil the vaporizable constituents of said contaminant and to a temperature suitable for initiation of the combustion of the nonvaporiz able constituents. withdrawing the distilled contaminant constituents and said oxygen-free gas from the top of said dlstilling zone, withdrawing said clay from the end of said zone opposite the end of clay inlet as a downwardly extending seal column and directing the clay from the lower end of said seal column into one end or a substantially horizontal, elongated regeneration zone. ilowing said clay as a continuous iiuidized bed of much Breater horizcnal dimensions than its vertical dimension substantially horizontally through said regeneration zone whie introducing an oxygencontaining gas through a plurality of openings distributed uniformly over the bottom of said zone and passing it upwardly through said bed in said regeneration zene at a rate suiiicient to maintain it in a uidized condition and to burn ofi' substantially all of the contaminant remaining on said clay flowing frcm said dlstilling zone, passing a suitable cooling Huid in indirect heat transfer relationship with said clay in said regeneration zone to maintain the temperature oi' said clay below a heat damaging level, withdrawing regeneration gas from the top of said regeneration zone, continuing the flow of said iiuidized bed of clay from the end of said regeneration zone opposite the clay inlet through a communicating ho. izontally extending cooling zone while introducing a suitable gas through a plurality of openings distributed uniformly over the bottom of said zone and passing it upwardly through the bed in said cooling zone at a rate suilicient to maintain it in a fiuidized condition, passing a suitable cooling uid in indirect heat transfer relationship with the clay in said cooling zone and downwardly withdrawing cooled, regenerated clay from the end of said cooling zone opposite its inlet; wherein said rst named seal column is 0f sumcient height to promote the iiow of said fiuidized bed of clay through said dlstilling zone and said last named seal column is of sufficient height to promote the flow of said i'luidized bed of clay through said regeneration and cooling zones.

5` The method of claim 4 characterized in that il the depth of said iiridized bed in said dlstilling,

regeneration and cooling zones is greater than two times the distance between adjacent openings for gas introduction in the bottom of said zones.

6. The method of claim 4, characterized in that the depth of said iluidized bed in said dlstilling. regeneration and cooling zones is greater than the tangent of the angle of internal ilow of said finely divided iuidized contact clay times the distance between adjacent openings for gas in troduction in the bottom of said zones, wherein the angle cf internal flow of the contact material lies within the range 65-80 degrees with the horizontal.

'1. The method for revivifying finely divided adsorbent materials bearing carbonaceous deposits which method comprises: passing a continuous stream of saidv finely divided contaminant bearing adsorbent in a substantially horizontal direction through an elongated, confined dlstilling sone over a fixed bed of solid particles maintained over the bottom of said dlstilling zone, said nxed bed being made up of particles of substantially larger size range than said divided adsorbent. heating said adsorbent passing through said dlstilling zone to a temperature suitable to distill vaporizable contaminant ccnstituents from said adsorbent and to a temperature suitable for subsequent initiation of com bustion of the residual non-vaporizable contaminant constituents by passing a suitable heating iluid in indirect heat transfer relationship therewith, passing a suitable oxygen-free gas upwardly through said nxed bed and through said adsorbent stream at a rate sumcient to mainto the one in said dlstilling zone, passing an oxygen containing gas upwardly through said xed bed and said adsorbent stream in said regeneration zone at a rate suilicient for substantially complete combustion of residual contaminant on said adsorbent and to maintain said adsorbent in a iluidized condition but insutllcient to iluidiae said iixed bed, withdrawing nue gas from said regeneration zone above the level oi' said adsorbent stream therein. passing said stream of adsorbent from said regeneration zone in a subsubstantially horizontal direction over a ilxed bed of solid particles in a communicating cooling zone said last named ilxed bed being similar to the fixed beds in said dlstilling and regeneration zones, passing a suitable low temperature gas upwardly through said xed bed and said adsorbent stream in said cooling zone at a rate suiiicient to maintain said stream in a iluidized condition but insuillcient to iluidize said iixed bed. and withdrawing cooled, regenerated adsorbent from said cooling zone.

8. The method for revivifying a ilnely divided stantially oxygen-free gas upwardly through the bed of said adsorbent in said dlstilling zone at a rate suilicient to maintain said bed in a uidized condition and to strip vaporizable constituents of the contaminant from said adsorbent, passing an oxygen containing gas upwardly through the bed of adsorbent in said regeneration zone at a rate sumcient to maintain said bed in a. uidized condition and to burn substantially all the remaining contaminant from said adsorbent, passing a low temperature gas which is inert to said adsorbent upwardly through the bed of adsorbent in said cooling zone at a rate suilicient to maintain said bed in a iiuidized condition, passing a heat exchange fluid in indirect heat transfer relationship with the fluidized bed of adsorbent in said dlstilling chamber to heat said adsorbent to a temperature suitable to distill oil the vaporizable constituents of the contaminant, passing the heat exchange fluid from said dis 75 zone in indirect heat transfer relationship with said iiuidized bed of adsorbent in said regeneration zone to maintain the temperature of the regenerating adsorbent at a level sufficiently high for contaminant combustion but below a heat damaging level, and returning the heat exchange fluid from said regeneration zone back into indirect heat transfer relationship with the ad sorbent in said distilling zone.

9. An apparatus for regeneration of finely divided adsorbcnt materials bearing carbonaceous contaminants which apparatus comprises: in combination a substantially horizontal, stationary distilling chamber, members defining a gas distributing manifold along the bottom of said chamber, said manifold having gas apertures therein opening into said chamber, said apertures being uniformly distributed over the horizontal cross-sectional area of said chamber, a conduit for solid material introduction extending into said chamber, from an external source, said conduit having its delivery end positioned near one lateral end of said chamber within the lower section thereof but spaced substantially above the bottom of said chamber, a solid material outlet near the opposite lateral end of said chamber, conduit means connecting said manifold for gas supply thereto, a separate external receiving vessel for receiving vapors from said distilling chamber, a conduit connected between said receiving vessel and the upper section of said distilling chamber for passage of distilled vapors, a plurality of uniformly spaced apart heat transfer tubes extending along the lower section of said distilling chamber at a level below the discharge end of said solid inlet conduit but above said gas I 7 distributing manifold, means to pass a heat exchange fluid through said tubes, a substantially horizontal, elongated, stationary burning chamber, members defining a gas distributing manifold along the bottom of said burning chamber, said manifold having gas apertures therein opening into said chamber, said apertures being uniformly distributed over the horizontal cross-sectional area of said chamber, conduit means connecting to said manifold for gas supply thereto, a gas outlet conduit connected to the top of said burning chamber communicating it with an external location other than said receiving chamber, conduit means connected between said solid outlet on said distilling chamber and one lateral end of said burning chamber, said conduit means having its discharge end positioned within the lower section of said burning chamber substantially above the bottom thereof, a plurality of spaced apart heat transfer tubes uniformly dlstributed across the lower section of said burning chamber below the level of the discharge end oi' said conduit means but above said gas distributing manifold, means to pass a cooling uid through said tubes a substantially horizontal, elongated, stationary cooling chamber, a gas distributing manifold along the bottom of said cooling chamber, said manifold having a plurality of gas apertures opening within said chamber and uniformly distributed over its horizontal cross-sectional area, conduit means connecting to said manifold for gas supply thereto, a gas outlet conduit connected to the top of said cooling chamber communicating it with an external location other than said receiving chamber, members denlng a restricted passage for solid flow from the end of said burning chamber opposite the end of solid material supply thereto into one distributing manifold along the bottom material outlet conduit connected to said cooling chamber near the opposite end thereof.

10. An apparatus for regeneration of finely divided adsorbent materials bearing carbonaceous contaminant which comprises: a substantially horizontal, elongated, stationary distilling chamber, a similar burning chamber and a similar cooling chamber, a separate gas distributing manifold positioned along the bottom of each of said chambers, said manifold having a plurality of gas apertures therein distributed uniformly over the horizontal cross-sectional area of the chamber, a separate conduit connecting into each of said manifolds for gas supply, a gas outlet conduit connected through the top of each of said burning and cooling chambers, a separate external receiving chamber for receiving distilled vapors from said distilling chamber, said receiving chamber being completely isolated from said burning and cooling chambers, a conduit connected between said receiving chamber and the top of said distilling chamber to communicate said chambers, a separate set of spaced heat transfer tubes distributed uniformly across the bottom of each of said chambers above the gas distributing manifold, separate inlet conduit means and outlet conduit means for heat exchange iluid flow associated with the set of heat transfer tubes in said cooling chamber, a conduit connecting one end of the set of tubes in the burning chamber to one end of the set of tubes in the distilling chamber and conduit means communicating together the opposite ends of said sets whereby a closed circuit is provided through which a heat exchange fluid may be passed cyclically, a circulating device in said closed circuit for circulating the heat exchange fluid cyclically through said sets of heat transfer tubes in said distilling and burning chambers, a conduit for solid material introduction extending into one lateral end of said distilling chamber, having its discharge end in the lower section of said distilling chamber but spaced substantially above the gas distributing manifold therein, conduit means communicating the opposite end of said distilling chamber with one lateral end of said burning chamber, said conduit means hav ing its delivery and discharge ends in the lower section of said distilling chamber and burning chambers, respectively, but spaced substantially above the gas distributing manifolds therein, members defining a restricted passage for solid ow between the opposite end of said burning chamber and one end of said cooling chamber, said passage communicating the lower section o! each of said last named chambers, a solid material outlet conduit connected to the opposite end of said cooling chamber at a level within the lower section thereof.

ll. An apparatus for regeneration of finely divided adsorbent materiais bearing carbonaceous contaminants which apparatus comprises: in combination a. substantially horizontal, station ary distilling chamber, members defining a. gas of said chamber, said manifold having gas apertures therein opening into said chamber, said apertures being uniformly distributed over the horizontal cross-sectional area of said chamber, a separate external receiving vessel for receiving vapors from said distilling chamber, a. conduit connected between said receiving vessel and the upper section of said distilling chamber for passage of distilled vapors, a plurality of uniformly lateral end of said cooling chamber, and a solid 7s spaced apart heat transfer tubes extending along l1 the lower section of said distilling chamber above said gas distributing manifold, means to pass a heat exchange fluid through said tubes, an elongated upwardly extending feed duct connecting into one lateral end of said distilling chamber, said duct terminating on its lower end within the lower section of said chamber a spaced distance above the bottom of said chamber and extending horizontally across the entire width of said chamber, a substantially horizontal elongated stationary burning chamber positioned elevationally below said distilling chamber, members defining a gas distributing manifold along the bottom of said burning chamber, said manifold having gas apertures therein opening into said chamber, said apertures being uniformly distributed over the horizontal cross-sectional area of said chamber, conduit means connecting to said manifold for gas supply thereto, a gas outlet conduit connected to the top of said burning chamber communicating it with an external location other than said receiving chamber, a substantially vertical duct for solid material flow connected Ibetween that end of said distilling chamber opposite the solid feed duct and' one lateral end of said burning chamber, said duct terminating on its upper end within the lower section of said distilling chamber a substantial distance aibove the gas distributing manifold therein and terminating on its lower end within 'the lower section of said burning chamber a spaced distance above the gas distributing manifold therein and said duct extending substantially the width of said chambers on its ends. a plurality of spaced apart heat transfer tubes uniformly distributed across the lower section of said 4burning chamber below the level of the discharge end of said duct Vbut above said gas distributing manifold, means to pass a cooling uid through said tubes a substantially horizontal, elongated, stationary cooling chamber positioned substantially on the same level as said burning chamber and communicating therewith substantially across the entire width of the lower portion of the end thereof opposite the solid supply duct to said burning chamber, duct means connecting through the bottom of said cooling chamber on its opposite end and flow throttling means associated with said last named duct means, a gas distributing manifold along the bottom of said cooling chamber, said manifold having a plurality of gas apertures opening within said chamber and uniformly distributed over its horizontal cross-sectional area, conduit means connecting said manifold for gas supply thereto, and a gas outlet conduit connected to the top of said cooling chamber communicating it with an external location other than said receiving chamber.

12. An apparatus for regeneration of finely divided adsorbent materials `bearing carbonaceous contaminant which comprises: a substantially horizontal elongated stationary distilling chamber, an elongated horizontal burning chamber positioned vertically below said cooling chamber and an elongated horizontal cooling chamber positioned on the same level as said burning chamber and communicating therewith substantially across the entire lower portion of one end, a perforated partition extending substantially horizontally across each one of said chambers shortly above its bottom to dene a gas distributing space along the bottom of said chamber, a separate gas inlet conduit for the distributing space in each of said chambers, a separate rerated partition in ceiving chamber for receiving hydrocarbon vapors distilled in said distilling chamber, a conduit for vapor flow connected between the top of said distilling chamber and said receiving charnber. separate gas outlet conduits connected into the tops of said burning and distilling chambers, a set consisting of a plurality of spaced heat exchange tubes extending substantially horizontally across said distilling chamber shortly above said partition therein, a heat exchange fluid supply conduit and a heat exchange fluid withdrawal conduit communicating with said set of tubes, a similar set of tubes similarly positioned in said burning chamber and inlet and outlet conduits communicating with said last named set of tubes, an upwardly extending feed duct extending down into said distilling chamber near one lateral end thereof and terminating on its lower end a substantial distance above the bottom of said chamber, an adjustable end piece on the lower end of said duct adapted to slide up and down, whereby the effective discharge level of said duct within the lower section of said distilling chamber may be adjusted, a vertical duct connected between a location in said distilling chamber near its opposite end and a location within said burning chamber near the lateral end thereof which -is opposite the end communicating with said cooling chamber, said duct terminating on its upper end above the level of said perfosaid burning chamber and -terminating on its lower end a substantial distance above said perforated partition therein, anadinstable `end piece on the lower end of said last named duct adapted to permit external adjustment of the discharge level of said duct above the perforated partition within the lower section of said burning chamber, an outlet duct connecting through the bottom of said cooling chamber near the lateral end thereof opposite the end of communication with said burning chamber, and a. flow throttling device on said outlet duct.

13. An apparatus for regeneration of finely divided adsorbent materials bearing carbonaceous contaminant which comprises: a substantially horizontal elongated stationary distilling chamber. a similar burning chamber and a similar cooling chamber, a separate gas distributing manifold consisting of spaced perforated pipes distributed uniformly over the bottom of each of said chambers, separate gas inlet conduit means to each of said manifolds, a separate gas outlet conduit connected through the top of each of said burning and cooling chambers, a vapor receiving chamber isolated from said burning and cooling chambers and communicated by means of a conduit with the uppersectlon of said distilling chamber, a separate set of spaced heat transfer tubes distributed uniformly across the bottom 'of each of said chambers above the gas distributing manifold, separate inlet conduit means and outlet conduit means forheat exchange fluid flow associated with the set of heat transfer tubes in each of said chambers, a mechanical feed device for solid material injection connected into one lateral end of said distilling chamber at a level not substantially above that of said heat transfer tubes but above that of the gas distributing manifold therein, a gas tight mechanical solid material conveying device connected between the opposite lateral end of said distilling chamber and one lateral end of said burning chamber said device connecting into said distilling and burning chambers at levels above the gas distributing manifold and not substanmoana tially above the heat transfer tubes in said chambers, a pipe for inert gas supply into said last named conveying device, a similar mechanical conveying device connected between the opposite lateral end of said burning chamber and said cooling chamber and connecting into said chambers at similar levels to said first named conveying device, and a mechanical discharge device connecting into the opposite lateral end of said cooling chamber at a level above said gas distributing manifold but not substantially above the heat transfer tubes therein.

14. An apparatus for regeneration of finely divided adsorbent materials bearing carbonaceous contaminant which comprises: a substantially horizontal elongated stationary distiliing chamber, an elongated horizontal burning chamber positioned vertically below said cooling chamber and an elongated horizontal cooling chamber positioned on the same level as said burning chamber and communicating therewith substantially across the entire lower portion oi one end, a perforated partition extending substantially horizontally across each one of said chambers shortly above its bottom to denne a gas distributing space along the bottom of said chamber, a separate gas inlet conduit for the distributing space in each of said chambers, a separate receiving chamber for receiving hydrocarbon vapors distilled in said distiliing chamber, a conduit for vapor flow connected between the top of said distiliing chamber and said receiving chamber, separate gas outlet conduits connected into the tops of said burning and distiliing chambers, a set consisting of a plurality of spaced heat exchange tubes extending substantially horizontally across each oi the distiliing burning and cooling chambers shortly above the perforated partition therein, a separate heat exchange iluld supply and a heat exchange fluid withdrawal conduit communicating with the set of tubes in said coollng chamber, an external heat exchanger, conduit means connecting said heat exchanger in series with the set of tubes in said distiliing c hamber on one end and with the set of tubes in the burning chamber on the opposite end a conduit communicating together the remaining opposite ends of the sets oi tubes in said distiliing and burning chamber thereby providing a closed cyclic 20 circuit for heat exchange vflow through the tubes in the burning chamber, the distiliing chamber and said external heat exchanger, a circulating pump connected into said closed circuit to cause circulation oi' the heat exchange fluid therein, a vertical solid material feed duct extending down into said distiliing chamber near one lateral end thereof and terminating on its lower end within the lower section of said distiliing chamber but a substantial distance above the perforated partition therein, a vertical duct connected between a location in said distiliing chamber near its opposite lateral end and a location within said burning chamber near the end thereof which is opposite the lateral end communicating with said cooling chamber, said duct terminating on its upper end above the level of said perforated partition in said burning chamber and terminating on its lower end within the lower section of said burning chamber but a substantial distance above the perforated partition therein, and an outlet duct connecting through the bottom of said cooling chamber near the end thereof opposite the lateral end of communication with said burning chamber, and a iiow throttling device on said outlet duct.

HAMILTON P. CALDWELL. Ja. JOHN W. PAYNE.

REFERENCES .CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date 1,562,550 Hall Nov. 24, 1925 1,868,512 Ahlmann July 26, 1932 2,066,561 Koeppl July 13, 1937 2,152,167 Ahlmann Mar. 28, 1939 2,311,976 Conn Feb. 23, 1943 2,320,562 Bransky June 1, 1943 2,367,281 Johnson Jan. i6, 1945 2,371,619 Hartley Mar. 20, 1945 2,381,119 Dill Aug. "l, 1945 2,387,936 Nicholls et al Oct. 30, 1945 2,409,234 Arveson Oct. l5, 1946 2,414,852 Burnside et al. Jan. 28, 1947 2,419,245 Arveson Apr. 22, 1947 2,431,630 Arveson Nov. 25, 1947 

1. THE METHOD OF REVIVIFYING FINELY DIVIDED ADSORBENT MATERIALS BEARING CARBONACEOUS DEPOSITS WHICH METHOD COMPRISES: PASSING A CONTINUOUS STREAM OF SAID FINELY DIVIDED CONTAMINANT BEARING ABSORBENT IN A SUBSTANTIALLY HORIZONTAL DIRECTION THROUGH AN ELONGATED CONFINED DISTILLING ZONE WHEREIN IT IS HEATED BY INDIRECT HEAT TRANSFER WITH A SUITABLE HEATING FLUID TO A TEMPERATURE SUITABLE FOR VAPORIZATION OF THE VAPORIZABLE CONSTITUENTS OF SAID CONTAMINANT, PASSING A SUBSTANTIALLY OXYGEN-FREE GAS UPWARDLY THROUGH SAID STREAM TRANSVERSELY TO ITS DIRECTION OF FLOW AT A RATE SUFFICIENT TO MAINTAIN SAID ADSORBENT IN A FLUIDIZED CONDITION AND TO STRIP SAID VAPORIZABLE CONSTITUENTS FROM SAID ADSORBENT, WITHDRAWING SAID OXYGEN-FREE GAS AND STRIPPED VAPORIZABLE CONSTITUENTS FROM THE UPPER SECTION OF SAID DISTILLING ZONE, PASSING SAID STREAM ADSORBENT FROM SAID DISTILLING ZONE THROUGH A SEPARATE BURNING ZONE IN A SUBSTANTIALLY HORIZONTAL DIRECTION WHILE PASSING A SUITABLE HEAT EXCHANGE FLUID IN INDIRECT HEAT TRANSFER RELATIONSHIP THEREWITH TO CONTROL THE TEMPERATURE OF SAID ADSORBENT AT A TEMPERATURE RANGE SUITABLE FOR COMBUSTION OF SAID CONTAMINANT AND BELOW A HEAT DAMAGING LEVEL, PASSING AN OXYGEN CONTAINING GAS UPWARDLY THROUGH SAID STREAM IN SAID BURNING ZONE IN A DIRECTION TRANSVERSE TO THE FLOW OF SAID STREAM AND AT A RATE SUFFICIENT TO MAINTAIN SAID ADSORBENT IN SAID BURNING ZONE IN A FLUIDIZED CONDITION AND TO EFFECT SUBSTANTIALLY COMPLETE COMBUSTION OF THE CONTAMINANT REMAINING ON SAID ADSORBENT, WITHDRAWING FLUE GAS FROM THE UPPER SECTION OF SAID BURNING ZONE, PASSING SAID STREAM OF ADSORBENT FROM SAID BURNING ZONE THROUGH A COMMUNICATING COOLING ZONE IN A SUBSTANTIALLY HORIZONTAL DIRECTION WHILE PASSING A LOW TEMPERATURE GAS WHICH IS INERT TO THE ADSORBENT UPWARDLY THROUGH SAID STREAM IN SAID COOLING ZONE IN A DIRECTION TRANSVERSE TO THE FLOW OF SAID STREAM AT A RATE SUFFICIENT TO MAINTAIN SAID ADSORBENT IN SAID COOLING ZONE IN A FLUIDIZED CONDITION AND WITHDRAWING COOLED REVIVIFIED ADSORBENT FROM SAID COOLING ZONE. 